Daddy Dom or Mommy Dom is the term for a certain type of Dominant who enjoys taking on a caring and nurturing role. They mainly match up with girls/boys otherwise known as 'littles'. DDLG stands for Daddy Dom/Little Girl and is a term often used in the BDSM community.
Daddy Dom and Mommy Dominants enjoy control, as all Dominants do. Their control can be in the form of written rules, choosing outfits as well as making lots of decisions for their littles. Daddy and Mommy Dominants are patient and caring, which is why they match up so well with the child-like littles.
BDSM comes into the Daddy and Mommy’s relationships with their littles in different ways. They strike a balance between encouraging the little’s child-like joy and enthusiasm and showing them the control they crave for. This is why they carry both the name Daddy or Mommy and Dominant at the same time. Caring in a parental type roll and controlling as a Dominant.
Daddy Doms and Mommy Doms are often instinctually good at aftercare because of their especially nurturing natures. This is essential when matching up with littles as they need lots of care and attention before, during and after a BDSM scene.
Not everyone who prefers their partners to be a little older than them is looking for a Hugh Hefner stereotype. Plenty of folk prefer their partner to have a little more experience than them, and there are loads of fetishes (such as Caregiver/little or Owner) that thrive off a bit of an age gap. The important thing is to make certain that, no matter what your sexual dynamic, in everyday life you're on the same level - power differentials are hot in kink terms and potentially abusive in everyday ones! Keep in constant communication, treat your partner as an equal outside of your dynamic and enjoy all the age gap relationships you could want.